If condition == true, then the participant was run through the both present condition

Practice trials = trials -3 through 0

Trial types:
1 = visual only
2 = self motion only
3 = combination
4 = conflict

second post location = the location of the second post of the outbound path
home location = the location of the home post

The y axis value of each location is meaningless; only the x and z values represent the location
along the ground axis.

The heading angle variable is meaningless due to a coding error.